EP0872217B2 - Medical or dental instrument for cutting body tissue or a replacement material with an abrasive tool - Google Patents

Abstract

The hand piece (3) has at its front end area a tool holder (5). A coupling holder (16) is provided for removable fixing of the tool in the holder surface which removes hard skin and a mounting (2) which holds the body and a handle (3). The function body A drive transmission connection (8) extends through the hand piece and provides rotational and/or lifting movement to the tool holder. In the drive connection, is an overload coupling (14) which limits the torque transmitted to the tool to a maximum level.

Description

The invention relates to a medical or dental treatment instrument according to the preamble of claim 1.

For the machining of body tissue or a substitute (tissue replacement or a prosthesis) treatment instruments with an abrasive tool and a vibration drive of a preferably lying in the sonic or ultrasonic range frequency are known. Such a treatment instrument is e.g. described in WO 96/14024. It has an elongate handpiece in the form of a sleeve-shaped housing, in the front region of a vibrating part is elastically yielding, which is in the operation mode by a vibration exciter vibratable and in its front region by a holding device with the tool is detachably connectable. In the rear end region, the handpiece has a coupling part, in particular a screw or plug-in coupling part, with which it can be coupled with a so-called connector of a supply device in the form of a flexible hose which extends to a supply and control device and media lines for power supply and supply of Treatment media such as Water, air or a spray containing.

A treatment instrument of this type can also be used as a dental calculus removal device in the field of dental medicine, such a treatment instrument known from the Austrian patent specification 379 505 having a tool with a wedge-shaped working tip.

In FR 2 613 090 A, a treatment instrument of the type specified in the introduction is described. This prior art handling instrument has a manually operable control device by means of which the power of a driven by compressed air vibration exciter is either increased or decreased. The control device comprises a variable throttle in the supply line for compressed air and an adjusting device with a rotating ring arranged on the treatment instrument, with which the throttle is variable. As a result, the admission of the vibration exciter can be controlled with compressed air in the sense of an optional magnification or reduction.

A medical or dental treatment instrument of the present type may be prone to failure in terms of its output, although the exciter is intended to deliver a constant and certain amount of oscillatory power to achieve optimum vibratory operation. The optimum vibration mode can be relatively easily affected by different performance levels, with hardly unavoidable vibration resonances can exert an adverse effect on the vibration behavior. This applies in particular to a treatment instrument whose vibration exciter can be driven by compressed air.

The invention is therefore based on the object, a treatment instrument specified in the preamble of claim 1 way in such a way that a constant oscillation power is achieved.

This object is achieved by the features of claim 1.

In this embodiment according to the invention, the treatment instrument is associated with a pressure regulator which ensures a constant operating pressure prevailing at the vibration exciter. This ensures that with hardly any fluctuations in the operating pressure, or when the treatment instrument is used at treatment stations where different operating pressures prevail (different manufacturers), the vibration power remains the same and thus optimal vibration operation can be maintained.

It is particularly advantageous to provide an adjustable pressure regulator, so that regardless of the amount of operating pressure adjustment of the size of the power and an optimal power setting is possible.

The known treatment instruments are tuned with respect to their vibration function to a particular kind of tool or to a specific processing. As a result, the scope of use of such a treatment instrument is limited

The invention further aims to improve the treatment instrument so that it is suitable for a wider range of applications. This is achieved by the features of claim 4.

In this embodiment of the invention, the vibration generator is associated with a control device for increasing and decreasing its output power, which allows a power setting in stages or continuously. This makes it possible to adapt the performance of the treatment instrument to different processing. The treatment instrument according to the invention is suitable for a wide range of applications, for example, for processing with different tools, in particular different size and / or shape and / or Abtragsfähigkeit (abrasiveness), with which it is optional equippable. Moreover, in the presence of only one tool as well as different tools, the performance of the treatment instrument is adaptable to different intensive operations, namely coarse and fine operations or coarse, medium and fine operations, these adjustments taking into account the same materials or different materials of the tool and / or or of the material to be processed. In this case, the inventive design also allows an adaptation of the treatment instrument to different types of processing, for example for the removal of coverings, as is the case with a scaling device, or for working out a Cavity, as it is eg the case during the preparation of a tooth.

In the dependent claims are included features that are durable and inexpensive to produce in a simple, small and reliable design, ensure a handling-friendly operation and allow easy assembly and disassembly.

Fig.1

ein erfindungsgemäßes Behandlungsinstrument zur Behandlung von Körpergewebe oder einem Ersatzstoff im axialen Schnitt;

Fig. 2

die in Fig. 1 mit X gekennzeichnete Einzelheit in vergrößerter Darstellung;

Fig. 3

die Einzelheit gemäß Fig. 2 in vereinfachter schematischer Darstellung;

Fig. 4

die in Fig. 1 mit Y gekennzeichnete Einzelheit, nämlich eine im vorderen Endbereich des Behandlungsinstruments angeordnete Haltevorrichtung für ein Werkzeug im axialen Schnitt;

Fig. 5

einen Längsabschnitt eines erfindungsgemäßen Behandlungsinstruments in abgewandelter Ausgestaltung im axialen Schnitt;

Fig. 6

den Längsabschnitt nach Fig. 13 in der Draufsicht.

In the drawing figures execution examples of the invention are shown. Show it

Fig.1

an inventive treatment instrument for the treatment of body tissue or a substitute in axial section;

Fig. 2

the detail marked with X in Figure 1 in an enlarged view.

Fig. 3

the detail of Figure 2 in a simplified schematic representation.

Fig. 4

the detail marked Y in FIG. 1, namely an axial-sectional holding device for a tool arranged in the front end region of the treatment instrument;

Fig. 5

a longitudinal section of a treatment instrument according to the invention in a modified embodiment in axial section;

Fig. 6

the longitudinal section of FIG. 13 in plan view.

The main parts of the generally designated 1 treatment instrument are an elongated or rod-shaped handpiece 2 with a grip sleeve 3, in which a preferably elongated or rod-shaped vibrating part 4 is mounted swingably and by a vibration exciter 5 in oscillations or driven, and a holding device 6 for at least a treatment tool 7, which has a tool shaft 8, which is releasably connectable to the holding device 6.

It is advantageous to design the treatment instrument 1 with at least one, preferably a plurality of so-called media lines, which are suitable for supplying drive energy and treatment media, such as, for example, a treatment liquid and / or compressed air and the supply of light to the treatment site serve. In the present embodiment, a light pipe 9 is provided, which extends longitudinally through the handpiece 2 into its front end region and opens out at an opening 11 directed towards the treatment site, and forms a lighting device 12. In addition, a conduit 13 extending longitudinally through the handpiece 2 for a treatment or cooling fluid, here water, is provided, which likewise opens out at an outlet opening 14 (FIGS. 4 and 7) arranged in the front end region of the handpiece 2 and directed towards the treatment site and forms a delivery device.

Further, a supply line 15 is provided for drive energy, which extends longitudinally through the handpiece 2 to the drive of the vibrator 5. In the present embodiment, a driven by compressed air vibration exciter 5 is provided and the supply line 15 is a compressed air line, which extends to the vibration exciter 5.

The handpiece 2 is releasably connectable by a quick coupling or by a screw or plug-in coupling, in particular by a freely rotatable plug-in rotary coupling 16, with an indicated connector 17, which is connected by a flexible supply line 18 to a supply and control device, not shown. The plug-in rotary joint 16 is formed in the present embodiment by a hollow cylindrical or stepped hollow cylindrical coupling recess 16a and therein with play insertable cylindrical or stepped cylindrical coupling pin 16b, wherein in the present embodiment, the coupling recess 16a is arranged in the rear region of the handpiece 2 and the coupling pin 16b protruding from the connector 17. The media lines enforce the plug-in rotary joint 16, so that in an optional separation of the handpiece 2 from the connector 17, the media lines are automatically interrupted. The light pipe 9 passes through the plug-in rotary joint 16 coaxially. In this case, a rear light pipe section coaxially in a corresponding receiving bore to the front end portion of the coupling pin 16b extend to the bolt with a parting line a front Lichtleftungsabschnitt shoots, which extends to the orifice 14. The front light pipe section is preferably formed by a light guide 9a made of light-conducting material, e.g. Glass or plastic formed, which may be a flexible light guide or a rigid light guide in the form of a fitting. The cross-sectional shape of the light guide 9 is preferably round behind and further elipsenförmig further ahead. The rear light pipe section can also be formed by a light guide, not shown, or by an electrical line with a arranged in the front end portion of the coupling pin 16 b lamp 19, which is preferably arranged sunk in a front open recess.

The two other media lines 13, 15 pass through the hollow cylindrical parting line 21 between the coupling pin 16b and the wall of the coupling recess 16a Z-shaped radially from the inside to the outside, wherein the respective existing in the lateral surface of the coupling pin 16a and the inner circumferential surface of the coupling recess 16b openings in one Ring groove 22 in the lateral surface or in the inner circumferential surface. As a result, the media passage is guaranteed in each rotational position of the plug-in rotary joint 16 also over 360 ° addition. The Z-shaped penetration points are each through a sealing ring 23, in particular an O-ring, sealed, which is arranged on both sides of the Z-shaped penetration point in an annular groove in the lateral surface of the coupling pin 16b or in the inner circumferential surface of the coupling recess 16a. On the back, connections, for example connecting sleeves 24, for the media line sections extending in the flexible supply line 18 can be arranged on the connecting piece 17.

The holding device 6 for the tool 7 is arranged in the front end region of the oscillating part 4. In the present embodiment, the oscillating member 4 is a rod or sleeve-shaped body which is arranged in the front half of the handpiece 2 and forms a handpiece shaft 25 which protrudes from the front end of the handpiece 2 and can extend straight or with respect to the longitudinal central axis 26 of Handpiece 2 may include an acute angle W of about 10 to 30 °, in particular about 20 °. The holding device 6 has a transversely or preferably at right angles to the handpiece shaft 25 extending plug hole 27, which is preferably a blind hole and thus only open on one side, and in which the tool shaft 8 with little movement play can be inserted. To secure the tool 7 in the inserted position, a securing recess 28 is provided in the tool shank 8 into which an adjustable in the longitudinal direction of the handpiece shaft 25 securing member 29 is moved, which between its moved into the securing recess 28 securing position and a moved out, the tool shank 8 releasing Release position is adjustable and is preferably acted upon by the force of a spring in its securing position. The securing recess 28 may be an annular groove. It can also be provided more evenly distributed on the circumference arranged calotte, which may preferably have conical depressions with a central core-free bore.

The handpiece shaft 25, which extends in the region of the handpiece 2 as a vibrating rod 4a, is mounted radially and preferably also axially resiliently or movably in the handpiece 2 against elastic restoring forces. For this purpose, in the front end region of the handpiece 2, a bearing sleeve 35 made of elastic material, e.g. Plastic or rubber, in the through hole 36 of the vibrating rod 4 a is received with peripheral contact, so that it is centered by the bearing sleeve 35. In the present embodiment, the bearing sleeve 35 in its front and rear end portion radially inwardly projecting, preferably in cross-section rounded Lagerwülste 37, between which an oscillating rod 4a surrounding annular gap 38 is arranged. The bearing sleeve 35 may be fixedly mounted in a sleeve cap 39 fixedly connected to a sleeve housing 41, e.g. is screwed therein, as shown in FIG. 1, and the peripherally complete each other steplessly and form the grip sleeve 3.

The bearing sleeve 35 projects beyond the sleeve housing 41 or the sleeve cap 39 and thus forms a protective jacket 35a for the handpiece shaft 25, which extends as far as or in the vicinity of the holding device 6 or an actuating member 92a to be described. For axial fixation of the bearing sleeve 35 and or the protective jacket 35a, a positive connection 40 is provided with an annular groove 40a and a ring pin 40b which engages therein and which automatically engages on insertion due to the elastically deformable material. The protruding elastic or soft-elastic protective sheath 35a, when treated from vibration, will interfere with the contact of the tool shank with adjacent body parts, e.g. Teeth, avoided. In the context of the invention, the protective jacket can also be arranged and fixed as a separate component only on the tool shank 25, for. B. slid on it elastically clamping or fixed by means of a corresponding positive connection 40 thereon.

In the rear region of the vibrating rod 4 a, the radially and axially elastically yielding bearing for the vibrating rod 4 a is formed by a bearing ring 42 made of elastically deformable material such as plastic or rubber, in particular an O-ring, in which the vibrating rod 4 a is seated with external contact the bearing ring 42 is received and supported in a sleeve 43 surrounding the vibrating rod 4a with a radial annular space 43a or in a rearwardly extending from the latter bearing part 44 and which is mounted in the sleeve housing 41 radially and axially stationary or preferably movable against a restoring force , is inserted in particular from the rear and rests with a front shoulder surface on a rear shoulder surface of the sleeve housing 41. The bearing part 44 has a front sleeve extension 45, which surrounds the vibrating rod 4 a with a radial distance, wherein the rear end of the vibrating rod 4 a in a free space 46 of the bearing part 44 ends. The front sleeve extension 45 is connected in an overlapping arrangement with the sleeve 43, preferably closing or plugged and sealed by a seal, which is thereby the bearing ring 42 is formed.

The oscillating rod 4 a can be arranged with the associated bearing elements coaxially to the longitudinal central axis 26. In the present embodiment, the longitudinal center axis 26a of the oscillating rod 4a bezgl. The longitudinal central axis of the front end portion of the grip sleeve 3 and the bearing sleeve 35 offset from the laterally disposed tool body 8a side and thus arranged eccentrically, wherein the Ausmündungsöffnung 11 and the associated passage 11a, in which the light guide 9a is received, bezgl. The vibrating rod 4a is arranged to the tool facing side, here in the corresponding eccentric bearing sleeve 35. The rear end of the light guide 9a is arranged by means of a bearing sleeve 47 in an extension of the coupling recess 16a, wherein the light guide 9a extends through an eccentric passage 44a in the bearing part 44 as a laterally arcuate shaped part forward. Opposite the optical waveguide 9a, the bearing part 44 has an eccentric rear pipe socket 48 to which a sleeve projection 49a of a coupling sleeve 49 adjoins, which alone or with the bearing part 44 as a composite component is mounted radially on all sides and axially movable against a restoring force in the sleeve housing 41 , For this purpose, at least one of the coupling sleeve 49 surrounding bearing ring 51 made of elastically deformable material, which centers the coupling sleeve 49 due to its elastic restoring force and radially resiliently superimposed. The bearing ring 51 preferably has an inner flange 53 which engages behind a rear shoulder surface 52 and supports the coupling sleeve 49 in an elastically yielding manner, also with respect to axial rearwardly directed movements. In the present embodiment, the assembly formed by the coupling sleeve 49 and the bearing member 44 between the inner flange 53 and the bearing ring 42 is resiliently mounted in both axial directions. In addition, between corresponding shoulder surfaces 41a, 44b, here between an inner shoulder of the sleeve housing 41 and an outer shoulder of the bearing part 44, an axially and preferably also diametrically effective bearing ring 50 be arranged elastically yielding material, wherein due to the elastic restoring force of the elastically yielding bearing elements centering is ensured, both axially and diametrically. The bearing ring 51 is positively fixed in the axial direction, for example, characterized in that its inner flange 53 bears against a forwardly directed shoulder surface of a threaded sleeve 54 screwed into the rear end of the sleeve housing 41.

In the rear region of the plug-in rotary coupling 16, a manually überdrückbare latching device 55 is provided for überdrückbaren latching in the coupling end position. In the present embodiment, the latching device 55, one or more distributed on the circumference in radial holes of the coupling sleeve 49 arranged, preferably formed by balls Verrastungselemente formed that can so far dive into the holes that the radially inner ends of the latching elements in an annular groove in Coupling pin 16b can engage. When manual override the plug-in rotary coupling the latching elements are automatically pushed out against a radially inwardly acting spring in the form of a spring ring 59 from the annular groove. The holes are tapered at their inner ends so that the latching element (s), preferably balls, can not fall inwardly when the coupling pin 16b is removed.

The media lines extend in the connector 17 as e.g. axially parallel channels 13a, 15a, which continue in the associated passage transverse plane in the form of angular channels in the coupling pin 16b and in the coupling sleeve 49, wherein a passage transverse plane E1 with respect to the other passage transverse plane E2 of the compressed air line is axially offset and the angular channels are designated in the coupling sleeve 49 with 13b, 15b. At the angle channel 13b of the line 13 for treatment liquid is followed by a tube or hose 13c, which is connected downstream with another tube or tube 13d, which passes through a rear wall 44b of the bearing part 44 in a bushing 44c sealed and in the cavity 61 of the sleeve-shaped Oscillating rod 4a extends into its central region in which an end sleeve 62 sealed by means of one or two sealing rings 62a sitting in the sleeve-shaped oscillating rod 4a and is tightly connected to the tube 13d, in particular is placed thereon.

The vibration generator 5 is associated with a control device for reducing or increasing its power. As a result, its performance or the intensity of the vibration or vibrations and the size of the amplitudes can be selectively reduced or increased and thus set. In this case, a power regulator 71 to be described in detail for automatic regulation of a preferably constant power and / or a preferably manually adjustable control device 72 may be provided, with or with which the power or the drive energy quantity that can be supplied to the vibration generator 5 is variable and can be reduced and increased and is automatically or in steps or continuously adjustable by a manual adjustment device 73. This allows the performance of the treatment instrument to be performed on the work to be done, e.g. Coarse and fine work or rough, medium and fine work or to different types of treatment and / or with regard to shape and / or size and / or coarse and fine or coarse, medium and / or fine effectiveness different tools 7 are adapted.

The manually operable adjusting device 73 has an adjusting member 74 which is manually accessible from the outside and axially or circumferentially adjustable and is in driving connection with the control device 72 or forms a control device. In the present embodiment, the adjusting member 74 is an adjusting sleeve 74a which surrounds the handpiece 2 preferably in the rear region and in particular recessed in a ring guide forming annular recess 75 and axially or preferably in the circumferential direction is adjustable. In the present embodiment, the annular recess 75 is bounded on the back by a shoulder surface of the screw-54. From the inner circumferential surface of the adjustment sleeve 74a, a support web 76 projects radially inwardly extending over a portion of the circumference and slots 77a, 77b in the sleeve housing 41 and the components arranged radially inwardly thereof, here in the coupling sleeve 49 and in the bearing ring 51, with motion play and carries at its inner end over a portion of the circumference extending segment 78, on one side a sloping or curved surface 79 which cooperates with an adjusting member 81 which is in operative connection with the control device 72, as shown schematically in Figure 3 and Figures 1 and 2 as an embodiment. The sloping or cam surface 79 may be disposed on the front side and rear side of the segment 78. In the present embodiment, in which the adjusting member 74 is located in the rear end portion of the handpiece 2, the inclined or cam surface 79 is disposed on the front side, and the adjusting member 81 is an adjusting pin 81a displaceably mounted in a guide 82 in an axially parallel manner by the force of a spring , Here is a compression spring against the Schrägoder cam surface 79 is acted upon and thus able to tap in a reciprocating rotation of the adjusting member 74. The guide 82 may be formed by an axparallele bore in the rotationally secured coupling sleeve 49.

The adjusting device 73 may be adjustable in stages or continuously: In both cases, it is advantageous to associate the adjusting device 73 with a locking device 83, which makes it possible to fix the adjusting device 73 in the respectively set position and thereby prevent an unintentional adjustment. This may be a braking device, which prevents unintentional adjustment of the adjusting member 74 due to their stiffness. In the present embodiment, a überdrückbare Verrastungsvorrichtung 84 is provided with a preferably formed by a ball, radially movably guided locking element 85 which is manually überdrückbar on turning the adjusting sleeve 74a in dome 86 and disengaged, on an outer circumferential surface of the coupling sleeve 49 in the circumferential direction are arranged one behind the other, here in the bottom of the groove or the slot 77b. The latching element 85 may be mounted radially displaceably in a radial bore in the carrier web 76 and be biased against the calottes 86 by a compression spring 88 arranged in the bore. The adjusting member 81 acts on the adjustable in its performance vibration exciter 5, so that its performance with the adjusting member 74 is either to increase or decrease.

In the present embodiment, in which the vibration exciter 5 is pneumatically driven or excitable, the control device 72 may have a control valve 65 for the purpose of controlling the effective at the vibration exciter 5 pressure p1. Here, the adjusting member 74 may be indirectly or directly connected to a valve spool 66, which controls the size of a valve opening 67 in response to the setting of the adjusting member 74. The valve opening 67 is located in the supply line 15, here downstream of the coupling pin 16b in the region of the angular channel 15b. To reduce the vibration power of the valve spool 66 is displaced with the adjustment device 73 in the sense of reducing the valve opening 67, in the present embodiment after vome, so that the valve opening 67 reduces the impulse p 1 at the p1 pressure in the sense of an adjustable throttle. To increase the power, the valve opening 67 is enlarged in the reverse sense, whereby a larger existing pressure p1 is set. The return of the adjusting member 74 may be effected by a return spring which biases the adjusting member 74 against the inclined or curved surface 79.

It is advantageous, in addition to or instead of the control device 72 for adjusting the p1 pressure, to provide an automatic pressure control device 71a with a pressure regulating valve 71b which sets a substantially constant effective pressure p1 independently of the existing operating pressure p2 in the supply line section 15a. As a result, even with considerable tolerances of the effective pressure p1 substantially equal working conditions and an approximately comparable performance or intensity of the tool 7 when connecting the treatment instrument to supply lines 18 and utilities with different operating pressures p2, in particular from different manufacturers, achieved.

Both in the presence of a control valve 65 and a control valve 71b, the valve spool 66 in the supply line 15, here in the axially parallel supply line section 15b arranged, preferably longitudinally displaceably mounted therein, the Ventilköffnung 67 can be controlled by an end face of the valve spool 66. The valve spool 66 may also have a pot-shaped shape, wherein the valve opening 67 may be arranged in the peripheral wall of the pot shape.

In the present embodiment according to FIGS. 1 to 3, a control device 72 or a manual adjusting device 73 in combination with a pressure regulating valve 71 b are provided. The valve spool 66 is acted upon on its one end face by the effective pressure p1 and biased on its other end face by means of a compression spring 68 opposite in its open position. In the present embodiment, the valve spool 66 is a round or non-circular pot-shaped sleeve having a bottom wall 66a at its end facing away from the vibration generator 5. The valve opening 67 is cooperatively arranged in the radially inner peripheral wall 66b with the radial portion of the supply line section 15b. In the open position, the valve slide 66 is tensioned by the spring 68 against a stop 66c, here the pipe socket 48. From the valve slide 66, a spring dome 66d extends to the rear, on which the compression spring 68 is seated and against a rear abutment 69, here against the adjusting member 81, supported.

In functional operation, the compressed air flows from the supply line section 15b through the annular gap present at the rear end into the cavity 61 of the sleeve-shaped oscillating rod 4a, which has one or more radial and / or secantial throughflow holes 63 in the middle region and in front of the end sleeve 62, in the region of which the oscillating rod 4a is surrounded by a wobble or vibration sleeve 64 with radial movement play, which is arranged with axial movement play between two stops 64a, each by a ring of elastic material, eg an O-ring can be formed, which sits in an annular groove in the vibrating rod 4a. During the flow through the gap between the vibrating rod 4a and the vibrating sleeve 64, the latter is set in vibration, which transmits it by mechanical impact on the vibrating rod. The gap is dimensioned so large that the vibration sleeve 64 does not hit against the inner wall of the surrounding sleeve 43. From the annulus 43a, the air flows through an air-permeable support ring 43b disposed between the swinging rod 4a and the front end portion of the sleeve 43, which may be perforated and made of elastic or compliant material, such as plastic or air-permeable material, e.g. Felt may exist in the free cavity 41b of the sleeve housing 41 and by a suitable in particular rear opening (not shown) in the sleeve housing 41 to the outside or e.g. through the channel 44a and through a suitable discharge channel in the coupling pin 16b back to the outside. The support ring 43b is axially fixed, here between an optionally conical shoulder surface on the vibrating rod 4a and an inner flange of the sleeve 43rd

The sleeve 43, in conjunction with the support ring 43b an inner housing or encapsulation of the vibration generator 5, whereby a significant reduction in noise is achieved in a simple and cost-effective manner.

The valve port 67 is an adjustable throttle that produces a pressure drop that determines the effective pressure p1. When the operating pressure p2 is greater or less than a certain value, the pressure p1 which produces the pressure force Fd acting on the valve spool 66 against the spring 68 initially changes, the position of the opening edge 66e determining the size of the valve opening 67 and thus also the size of the throttle that generates the effective pressure p1 is determined by the balance of the spring force and the pressing force Fd. In functional operation, the valve spool 66 assumes a functional position remote from the illustrated stop position (inoperative position), in which e.g. at a mean operating pressure p2, the valve opening 67 occupies a size in the central region. At a lower operating pressure p2, the valve spool 66 is moved to an equilibrium position (here to the left) in which it controls a larger valve opening 67. At an increased operating pressure p2, the valve spool 66 assumes a (here shifted to the right) equilibrium position in which it controls a smaller valve opening 67. Due to this function, the control valve 71b automatically regulates a substantially constant p1 pressure in a determinable pressure range different operating pressures. This pressure control functions both when a setting device 73 or another control device 72 is absent, as well as when - as in the present embodiment - the pressure or power controller 71 is arranged in combination with the adjusting device 73 or other control device 72 or also when, as in the present embodiment, the manual adjusting device 73 or another control device 72 acts on the pressure regulating valve 71b or on its valve slide 66. Preferably, a common valve opening 67 for the pressure regulating valve 71b and the manual adjusting device 73 or other control device 72 is present. As a result, the construction and production costs are considerably reduced and simplifies the construction.

In the present embodiment, the biasing force of the valve spring 68 is changed by means of the adjusting device 73 and indeed increased for high power consumption and reduced for lower power consumption. At higher power requirements, the adjusting member 81 is thus displaced in the direction of the control or regulating valve 65, 71b and removed at a lower power requirement from the control or regulating valve 65, 71b, i. shifted to the rear, which is illustrated by the reference Fmin and Fmax. In the present embodiment, the power of the power controller 71 is changed by means of the adjusting device 73 in the sense of increasing or decreasing the deliverable power on the tool 7, regardless of the size of the operating pressure p2.

As a result, the treatment instrument 1 can be adapted not only to different treatment methods but also to tools 7 of different shape and / or size and / or abrasive ablation capability, e.g. coarse and fine or coarse, medium and fine, adjust, with a vote in consideration of tools 7 different masses and / or shapes is possible. In addition, with the adjustment device 73 mutually disturbing vibration states can be largely eliminated by changing the vibration amplitudes.

The main direction of the vibration amplitude is directed substantially transversely to the vibrating part 4a and thus substantially in the longitudinal direction of the tool 7. Due to the radial and axial elastically resilient mounting of the vibrating part 4 a, however, inter alia caused by resonances caused spatial vibrations, so that the tool 7 is also abrasive in the transverse direction.

In the present embodiment, the oscillation or vibration drive has a frequency in the sonic or ultrasonic range of about 4 to 8 kHz, preferably about 6 kHz, wherein in the region of the tool 7, an amplitude of the spatial movements of about 0.05 mm 0.2 mm, in particular about 0.1 mm results.

The treatment instrument according to the invention is therefore particularly suitable for different tools 7, which are associated with the treatment instrument as a tool assortment and differ from each other due to different shape and / or size and / or purpose.

The treatment instrument 1 may be assigned to perform different processing different tools 7, with which it can be optionally equipped. These may be tools 7 of e.g. different shape and / or mass and / or nature of the abrasive work surface, z. Coarse, medium, fine, and / or tools 7 suitable for delivery of a treatment medium, e.g. Coolant, are set up or not. Different performance requirements may exist for such different tools to achieve optimal performance or performance. For tools 7 of different mass, this may be due to the fact that the mass vibration is particularly favorable at a power setting of specific magnitude, e.g. considering vibration resonances. For tools 7 different nature of their work surfaces, such. Coarse, medium or fine, a power setting of specific size is also advantageous for the purpose of improving performance. In addition, it should be borne in mind by this criterion that the worktops may tend to settle with chips and therefore a specific power setting is also advantageous. A power setting in a specific size and is also advantageous in tools 7, which work with a coolant or dry. It is therefore advantageous, and is used for easier handling, if the treatment instrument 1 marks 155 are arranged for the adjusting member 74 so that in position matching of the adjusting member 74 in terms of or a certain mark a power is set for an associated tool 7 with a corresponding mark 156 is advantageous. They may be colored or other markers, e.g. Symbols, each associated with an associated index 155a for positional matching on the adjustment path on the treatment instrument. In the present embodiment, one or more indicia 155 and one or more associated indices 155a may be disposed on the adjusting member 74 and on the gripping sleeve 41 as shown in simplified form, e.g. in the form of a scale, wherein on one part the markings 155 and on the other part of the at least one index 155a is arranged. The corresponding marking 156, for example: on the tool shank 8 in the vicinity of the tool head, can be arranged on the tools 7 in each case. Different colors are particularly well suited for distinguishing one marking pair 155, 155a, 156 from another marking pair 155, 155a, 156, wherein mutually corresponding marking rounds 155, 155a, 156 preferably have the same color.

In the embodiment of FIGS. 5 and 6, provided in the same or similar parts with the same reference numerals, the adjustment device 73 preferably also in the form of an adjusting sleeve 74 a 74a in the correspondingly longer sized groove 75 axially verschiebar and in the respective Setting position by the locking device 83 is infinitely or in stages lockable. In this embodiment, the adjusting member 81 is rigidly connected by a radial connecting pin 161 with the adjusting member 74, wherein the connecting pin 161 passes through a longitudinal Einstellnut 162 in the sleeve housing and wherein the longitudinal groove walls 163 clamp the connecting pin 161 so strong between them that the connecting pin is axially displaceable only with a manual force, but is detected against unintentional displacement, however, by the clamping action of the groove walls 163. For this purpose, the adjustment groove 162 may be formed in an insert 164 of elastically deformable material, e.g. Plastic, be formed, which sits in a corresponding recess 165 in the sleeve housing 41. If certain setting points are to be realized, 163 latching recesses 166 may be arranged in one or both groove walls, in which the connecting pin 161 is able to engage. In the present embodiment, three locking points are arranged axially behind one another. To illustrate this, the illustrated longitudinal section of the treatment instrument 1 without the adjusting sleeve 74a is shown in FIG.

The markings 155, 155a and 156 can be arranged in this embodiment at the front edge or trailing edge of the adjusting member 74 and the lateral surface of the sleeve housing 41 located next to it.

Claims (22)

1. Medical or dental-medical treatment instrument (1) for the material-removing working of body tissue or a substitute material, having an abrasive tool (7), consisting of a handpiece (2) in the forward end region of which there is mounted an oscillation part (4) carrying the tool (7), which can be set into oscillation by means of an oscillation generator (5) in the handpiece (5), the handpiece (2) being connected or connectable at its rearward end region with a flexible supply line (18) which extends from a supply device, and the oscillation generator (5) being driveable or excitable by means of compressed air which is delivered through a delivery line (15b) extending through the handpiece (2),
   characterized in that,
   there is provided in the delivery line (15b) a pressure regulator (71a) which even in the presence of differently high operating pressures (p2) regulates a substantially constant working pressure (p1) effective at the oscillation generator (5),
   the pressure regulator (71a), and therewith the power of the oscillation generator (5), being adjustable.
2. Medical or dental-medical treatment instrument (1) according to claim 1,
   characterized in that,
   the pressure regulator (71a) includes a pressure regulation valve (71b) having a valve slider (66) which is mounted displaceably, preferably axially, by the working pressure (p1) against the force of a spring (68), and in the case of a greater operating pressure (p2) controls to a smaller valve opening (67) and in the case of a smaller operating pressure (p2) controls to a greater valve opening (67).
3. Medical or dental-medical treatment instrument (1) according to any preceding claim,
   characterized in that,
   there is provided a control device (72) with which the power can be increased or decreased.
4. Medical or dental-medical treatment instrument according to claim 3,
   characterized in that,
   there is provided a setting device (73) having a manually adjustable setting member (74) which acts upon the control device (72) or constitutes the control device (72).
5. Medical or dental-medical treatment instrument according to claim 3 or 4,
   characterized in that,
   the oscillation generator (5) is driveable or excitable by means of compressed air and the control device (72) is constituted by means of a control valve (65) the valve slider (66) of which controls the size of a valve opening (67) which is arranged in a delivery line (15b) for compressed air extending to the oscillation generator (5).
6. Medical or dental-medical treatment instrument according to claim 5,
   characterized in that,
   the control valve (65) has a valve slider (66) which is preferably axially movably mounted and is acted upon by the pressure (p1) effective at the oscillation generator (5) against the force of a spring (65) and has a control edge (88) for controlling the size of the valve opening (67).
7. Medical or dental-medical treatment instrument according to claims 2 and 5 or 6,
   characterized in that,
   there is provided a common valve slider (66) for the pressure regulator (71a) and the control device (72).
8. Medical or dental-medical treatment instrument (1) according to any of claims 3 to 7, characterized in that,
   the control device (72) acts upon the pressure regulator (71a) or upon the valve slider (66).
9. Medical or dental-medical treatment instrument (1) according to claim 8,
   characterized in that,
   the force of the spring (68) can be varied by the means of the control device (72).
10. Medical or dental-medical treatment instrument according to any of preceding claims 4 to 9,
    characterized in that,
    the setting device (73) and/or the control valve (65) and/or the pressure regulating valve (71b) is or are arranged in the handpiece (2).
11. Medical or dental-medical treatment instrument according to claim 10,
    characterized in that,
    the setting member (74) is arranged in the rearward end region of the handpiece (2).
12. Medical or dental-medical treatment instrument according to any of claims 4 to 11,
    characterized in that,
    the setting member (74) is arranged on the outer surface of the handpiece (2), or forms the outer surface, and is preferably adjustable in the circumferential direction.
13. Medical or dental-medical treatment instrument according to claim 12,
    characterized in that,
    the setting member (74) is formed by means of a sleeve (74a).
14. Medical or dental-medical treatment instrument according to any of preceding claims 4 to 13,
    characterized in that,
    the setting device (73) has an adjustment member (81) movably mounted in the handpiece (2), which adjustment member is connected with the setting member (74) by means of a step-down transmission.
15. Medical or dental-medical treatment instrument according to any of preceding claims 4 to 14,
    characterized in that,
    the setting device (73) has an adjustment member (81) mounted movably, preferably axially, in the handpiece (2), which adjustment member is connected with the setting member (74) by means of a mechanism which alters the direction of movement of the adjustment member (81) with regard to that of the setting member (74).
16. Medical or dental-medical treatment instrument according to any of preceding claims 5 to 16,
    characterized in that,
    from the setting member (74) a web (76) projects radially inwardly through a slot (77a) of the grip sleeve (41), which has an oblique or curved surface (79), preferably at the rearward side or forward side.
17. Medical or dental-medical treatment instrument according to any of preceding claims 4 to 16,
    characterized in that,
    the setting member (74a) is connected with an adjustment member (81) which forms an abutment for the spring (68) of the control valve (65).
18. Medical or dental-medical treatment instrument according to any of claims 4 to 17,
    characterized in that,
    there is associated with the setting device (73) a fixing device (83) or a latching device (84), which can be manually overcome, for securing in the respectively set position.
19. Medical or dental-medical treatment instrument according to any of preceding claims 4 to 18,
    characterized in that,
    there is or are arranged on the adjustment path of the setting member (74) a marking (155) and/or a scale in each case with a counter-marking or a counter-scale or an index and/or one or more latching points (166) on the setting member (74) and a part neighbouring thereto, in particular the part carrying the setting member (74).
20. Medical or dental-medical treatment instrument according to claim 19,
    characterized in that,
    the marking (155) has different characters, or colours.
21. Medical or dental-medical treatment instrument according to claim 19 or 20,
    in combination with,
    a plurality of different tools (7) which differ from one another for example with regard to their shape and/or size and/or strength and/or material-removal capabilities.
22. Medical or dental-medical treatment instrument according to claim 21,
    characterized in that,
    the tools (7) have, preferably in each case on the tool shaft, (8) a marking (156), the positioning of the marking (155) and/or of the latch points (166) on the adjustment path corresponding to a certain specific distinguishing feature of the associated tool (7).

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